Tool slide adjusting means



A. SCRIVENER TOOL SLIDE ADJUSTING MEANS Filed March 23, 1945 vv vvvv vvr 1 ////////x///////44 7/ f it A 1 a, v Iv m V J Nov. 2, 1943.

Patented Nov. 2, 194a UNITED STAT-ES PATENT OFFICE 'roor. sma' ffiime mums I Arthur Scrivener, Birmingham, England Application March 2a, 1943, was... 480,158 In Great Britain March a, 1942 2 Claims. (c1. 51-186) The object of the invention is to provide what may be termed a differential or dual setting control of the slide whereby a relatively quick preliminary or initial setting or the tool or work can be efiected and an ultimate or final setting can be effected by what may be termed an auxiliary or subordinate control mechanism.

The invention consists in the application to a slideway grinder or other machine tool incorporating an adjustable slide of a dual or difierential control mechanism for efiecting a setting of the slide, whereby a relatively quick initial setting may be achieved, and the final setting can be effected by a control which is subordinate to the initial setting mechanism, both of the setting mechanisms being associated with a common spindle.

A specific application of the invention will now be described with reference to the accompanying sheet of drawings which illustrate a slideway grinder of a known construction in which is embodied the features of the present invention.

The drawing is a part sectional side elevation on a line approximating to the longitudinal centre-line through the main vertical spindle.

The grinding wheel a is mounted through the spindle b and the housing and the parts contained within the housing by means of the pivotal connection d to a slide e which slide is permitted a vertical motion in a slideway 1 formed in and as part of the framework of the machine. The slide e is mounted'relative to a vertically disposed screwed spindle g which at its upper end is located within a pair of thrust bearings h mounted on either side of a laterally extending bracket a forming part of the main framework of the machine. The upper end .0! this screwed spindle g has mounted thereon a worm wheel k :to which rotation is imparted from the worm drive of a small electric motor 1 embodying a reverse control gear, the casing of the motorl being mounted on the framework or the machine and serving to effect the initial or preliminary major adjustment of the slide e whereby the grinding wheel a is directed toward or away from the work at a relatively quick setting speed.

located on and toward the lower end of the vertically disposed screwed spindle 0 is a sleeve nut m which is rotatably mounted within a bracket 11. laterally extending from and forming part or the adjustable'slide e. This sleeve nut m is keyed to a worm wheel 0, the arrangement being such that the rotation of the worm wheel 0 and the coupled sleeve nut m by means or a hand wheel control indicated at p which rotates the worm q will effect a lifting or lowering motion of the slide e upon the screwed spindle g, whereby the iinal or minute setting of the grinding .wheel a can be effected to complete the initial quick setting which has been eflected through the motor drive. The sleeve nut m and the associated worm wheel 0 are restrained from vertical motion within the bracket 11. by means of the flange m on the sleeve nut 12:. and the pair of lock nuts m which also serve to retain the worm wheel 0 relative to the sleeve nut m.

, It should be appreciated that when the motor drive is operating the friction obtaining in the hand wheel controlled final or Vernier setting mechanism and the slide connection members pqom is sufiicient to maintain the worm wheel 0 and the coupled sleeve nut m stationary, and to permit of the vertical adjustment of the screwed spindle g therethrough; and that on the other hand when the hand-controlled final adjustment mechanism controlled by the handwheel p is in operation, the friction obtaining in the motor driven worm gear for the initial or relatively quick setting motion is' sufficient to maintain this gear transmission stationary, i. e. when the final or vernier adjustment of the slide e is being effected the screwed spindle g is held stationary and the slide e and the Parts associated therewith can be vertically adjusted thereon,

In order to secure an accurate final setting of the grinding wheel a through the hand wheel controlled mechanism it is desirable that any back lash or slack which might possibly obtain in the motor driven gear transmission is avoided, and this can be accomplished by incorporating a spring or other loading of the motor driven worm transmission so as to ensure that there is always a tendency or bias of this gearing in the one direction.

It will be appreciated that this invention can be applied with equal advantage to other forms of machine tools than slideway grinders, for instance it can be applied to a machine tool in which the work is mounted on the slide and the slide requires to be adjustably set in relation to a fixed tool mounting.

It is further to be appreciated that this invention could be utilised in connection with other forms of power-operated feed mechanism 'where it is desired that the feed should operate at two diflerent speeds, i. e. say a quick run up.

eem M N w yi'th s slow approach or a relatively slow teed V l and quickreturn, and that the invention is not limited to the particular application described in this specification.

of the r keyed I claim: flsnee 1. In s device or the class described, in comuts binstion, a feed slide, a collar connected'to the r coopere slide, a sleeve journaled in sndproiecting from sleeve the collar, a gear fixed on a projecting portion th respect ot the sleeve. means for restraining the sleeve 1 thr lded in the sleeve. means vine and -:ear against endwise movement with rescrew for rapid traverse oi! the slide and means specttothecollanascrewthreadedinthe ord lv nl eseartorslowteedoi'thesllde sleeve, means for driving the screw for rapid traverse oi the slide, and means for driving the Ari'rntmscmvmm gear for slow feed of the slide. 

